Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/08—Processes
  • C08G18/16—Catalysts
  • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
  • C08G18/1808—Catalysts containing secondary or tertiary amines or salts thereof having alkylene polyamine groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/08—Processes
  • C08G18/16—Catalysts
  • C08G18/22—Catalysts containing metal compounds
  • C08G18/24—Catalysts containing metal compounds of tin
  • C08G18/244—Catalysts containing metal compounds of tin tin salts of carboxylic acids
  • C08G18/246—Catalysts containing metal compounds of tin tin salts of carboxylic acids containing also tin-carbon bonds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/302—Water
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
  • C08G18/3203—Polyhydroxy compounds
  • C08G18/3206—Polyhydroxy compounds aliphatic
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/48—Polyethers
  • C08G18/4829—Polyethers containing at least three hydroxy groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
  • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
  • C08G18/6666—Compounds of group C08G18/48 or C08G18/52
  • C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
  • C08G18/6674—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
  • C08G18/6677—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203 having at least three hydroxy groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/73—Polyisocyanates or polyisothiocyanates acyclic
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
  • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
  • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
  • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
  • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
  • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
  • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
  • C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
  • C08K3/20—Oxides; Hydroxides
  • C08K3/22—Oxides; Hydroxides of metals
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
  • C09D175/04—Polyurethanes
  • C09D175/08—Polyurethanes from polyethers
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/60—Additives non-macromolecular
  • C09D7/61—Additives non-macromolecular inorganic
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
  • C08K3/20—Oxides; Hydroxides
  • C08K3/22—Oxides; Hydroxides of metals
  • C08K2003/2206—Oxides; Hydroxides of metals of calcium, strontium or barium

Definitions

• the present invention relates to a two-component coating composition
• a two-component coating composition comprising one first saturated polyhydroxy component, optionally one second saturated polyhydroxy component, optionally further polyhydroxy components, wherein the one second polyhydroxy compound is different from the one first polyhydroxy compound, at least one polyisocyanate and at least one metal component.
• the resulting composition offers excellent scratch resistance, better mechanical properties and good applicability.
• Coatings are an important and rapidly growing value-added application.
• a coating often has a decorative and a protective function.
• Coating compositions for construction, in particular for flooring and waterproofing, are mostly based on epoxy resins or polyurethane resins.
• An epoxy resin based coating composition provides aesthetically pleasing and glossy surfaces.
• an epoxy resin based flooring composition suffers from certain disadvantages. For example, undesired blushing effects may occur, especially at lower temperatures. Besides, the gloss intensity is often influenced by the temperature and may decrease in cold environments. Furthermore, the chemicals involved (i.e. epoxides and amines) are increasingly considered hazardous by European Union Regulation REACH, so that an alternative chemistry to overcome such limitations is desirable.
• Polyurethanes consist of polymers composed of a chain of organic units joined by carbamate (urethane/urea) links resulting from the reaction between a hydroxyl group or an amine group and an isocyanate group.
• PUs Polyurethanes
• Polyurethane polymers are usually formed by reacting an isocyanate with a polyol where both the isocyanate and the polyol contain on an average two or more functional groups per molecule.
• PUs can be produced in many different forms from very low-density foams to high performance composites and can thus be used in a multitude of applications. Examples of applications include flexible high-resilience foam seating, rigid foam insulation panels, electrical potting compounds, high performance adhesives, surface coatings, packaging, surface sealants and synthetic fibres.
• PU coatings are valued particularly for durability, abrasion resistance, aesthetics, and formulation flexibility.
• PU coatings can be delivered in numerous formats to meet the process requirements of almost every operation.
• Two-component polyurethane coatings are probably the most commonly known of all the polyurethane coatings.
• Two-component describes a process in which there are two resin packages (often referred to as part A and part B) mixed immediately prior to the application.
• One package contains a resin with reactive chemical groups (e.g., hydroxyls or amines); the other package contains a polyisocyanate resin capable of reacting with the chemical groups.
• the key advantage of the two-component coating is the theoretically infinite storage stability coupled with rapid curing reaction once the two resins are mixed and a simple mixing process before application.
• Two-component polyurethanes using sufficiently slow curing amines and three-component polyurethanes using water and a CO 2 scavenger are known for long time.
• three-component packages are not popular in the market and the amines used in the two-component polyurea compositions are comparably expensive and frequently hazardous to health.
• U.S. Pat. No. 5,077,349 A discloses a process for the preparation of polyurethane plastics.
• This two-component composition based on the polyol polybutadiene resin is highly flexible and has low tensile strength.
• the coating composition resulting from the above cited prior art is soft and hence does not offer the desired mechanical strength to the coatings.
• Multi component compositions create complications in use often resulting in errors during application that result in premature failure of the coating or flooring.
• Multi component materials are also limited in their application procedure. For example, spray application is not possible with standard industry equipment.
• the presently claimed invention is directed to a two-component composition
• a two-component composition comprising:
• one first saturated polyhydroxy compound selected from the group consisting of polyether polyol, polyester polyol, C 2 to C 32 alkyl polyol and sugar alcohol;
• At least one metal component selected from the group consisting of metal oxide, metal hydroxide, metal aluminate and metal silicate;
• Component B comprising at least one polyisocyanate.
• the weight ratio of component (A) to component (B) is in the range of 1:20 to 3:1.
• composition comprising two essential components.
• Such a composition may additionally comprise one or more other optional components.
• poly designate substances, which formally contain per molecule, two or more of the functional groups.
• the compound itself can be monomeric, oligomeric or polymeric compound.
• a polyol is a compound having two or more hydroxy groups
• a polyisocyanate is a compound having two or more isocyanate groups.
• average functionality denotes the average number of functional groups on a given molecule.
• M w represents the weight average molecular weight and is determined according to DIN 55672-1 and referred to polystyrene calibration standard.
• ‘% by weight’ as used in the present invention is with respect to the total weight of the two-component composition.
• saturated denotes that the polyhydroxy compound has only single bonds between carbon atoms.
• oligomer denotes a molecule that consists of 2-10 monomers but do not have necessarily a molecular mass distribution.
• prepolymer refers to a monomer or system of monomers that have been reacted to an intermediate molecular mass state. This material is capable of further polymerization by reactive groups to a fully cured high molecular weight state.
• a group is defined to comprise at least a certain number of embodiments, this is meant to also encompass a group which preferably consists of these embodiments only.
• the terms “first”, “second”, “third” or “(a)”, “(b)”, “(c)”, “(d)” etc. and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.
• first”, “second”, “third” or “(A)” “(B)” and “(C)” or “(a)”, “(b)”, “(c)”, “(d)”, “i”, “ii” etc. relate to steps of a method or use or assay there is no time or time interval coherence between the steps, that is, the steps may be carried out simultaneously or there may be time intervals of seconds, minutes, hours, days, weeks, months or even years between such steps, unless otherwise indicated in the application as set forth herein above or below.
• the one first polyhydroxy compound and the one second polyhydroxy compound, of the present invention is a saturated or (partly) aromatic polyhydroxy compound.
• the one first polyhydroxy compound and the one second polyhydroxy compound of the present invention is a non-alkaline saponifiable polyhydroxy compound and thus resistant to alkaline hydrolysis.
• the inventively claimed two-component coating composition does preferably not contain any unsaturated polyolefin polyol, such as polybutadiene polyols and polyisoprene polyols, more preferably the inventively claimed two-component coating composition does not contain any polybutadiene diol.
• the one first polyhydroxy compound of the present invention has at least two hydroxyl groups and a hydroxyl group content in the range of ⁇ 0.5 wt.-% to ⁇ 15 wt.-%, preferably ⁇ 3 wt. % to ⁇ 10 wt. %, by weight of the polyhydroxy compounds.
• the one first polyhydroxy compound of the present invention is selected from the group consisting of polyether polyol, polyester polyol, C 2 to C 56 alkyl polyol and sugar alcohol.
• the one first polyhydroxy compound of the present invention is selected from the group consisting of polyether polyol and polyester polyol.
• the one first polyhydroxy compound is a polyether polyol.
• the polyether polyols are obtained by known methods, such as but not limited to, anionic polymerization of alkylene oxides with addition of at least one starter molecule which comprises from 2 to 8, preferably from 2 to 6, reactive hydrogen atoms in bound form in the presence of catalysts.
• catalysts it is possible to use alkali metal hydroxides such as, but not limited to, sodium or potassium hydroxide or alkali metal alkoxides, such as but not limited to, sodium methoxide, sodium or potassium ethoxide or potassium isopropoxide or, in the case of cationic polymerization, Lewis acids such as antimony pentachloride, boron trifluoride etherate or bleaching earth catalysts.
• double metal cyanide (or DMC) compounds can also be used as catalysts, as already described hereinabove.
• Suitable polyether polyol includes products obtained by the polymerization of a alkylene oxides, such as ethylene oxide, propylene oxide, butylene oxide, and tetrahydrofuran in the presence of a starter molecule.
• Suitable starter molecule includes a plurality of active hydrogen atoms, and include, but are not limited to, water, butanediol, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol, bisphenol-A or -F, ethanolamine, diethanolamine, triethanolamine, toluene diamine, diethyl toluene diamine, phenyl diamine, diphenylmethane diamine, ethylene diamine and cyclohexane diamine.
• polyether polyol examples include, but are not limited to, polyethyleneoxide polyol and polypropyleneoxide polyol, in particular polyethyleneoxide diol, polypropyleneoxide diol, polyethyleneoxide triol and polypropyleneoxide triol.
• polyether polyols are known to the person skilled in the art and therefore, the present invention is not limited by the choice of such polyols.
• commercially available polyether polyol such as, but not limited to, Arcol® from Covestro may also be used for the purpose of the present invention.
• polyether polyol examples include, ethylene oxide-terminated (“EO-endcapped”, ethylene oxide-end-capped) polypropylenoxide polyols, styrene-acrylonitrile-grafted polyetherpolyols, e.g. Lupranol® from BASF SE, VoranolTM polyols, VoraluxTM polyols, SpecflexTM polyols from Dow Chemicals and Desmophen® from Covestro.
• EO-endcapped ethylene oxide-end-capped
• polypropylenoxide polyols examples include polypropylenoxide polyols, styrene-acrylonitrile-grafted polyetherpolyols, e.g. Lupranol® from BASF SE, VoranolTM polyols, VoraluxTM polyols, SpecflexTM polyols from Dow Chemicals and Desmophen® from Covestro.
• polyether polyol examples are derived from the monomers consisting of ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran (hereinafter referred to as THF) and a mixture thereof.
• THF tetrahydrofuran
• derived refers to the building block of the polyether polyol.
• the polyether polyol is derived from the monomer of THF.
• Commercially available polyether polyols such as, but not limited to, PolyTHF® from BASF SE may also be used for the purpose of the present invention.
• the polyether polyol has a hydroxyl value in the range of ⁇ 30 to ⁇ 600 mg KOH/g, more preferably in the range of ⁇ 30 to ⁇ 500 mg KOH/g and most preferably in the range of ⁇ 30 to ⁇ 450 mg KOH/g determined according to DIN 53240.
• the polyether polyol has a functionality in the range of ⁇ 1.7 to ⁇ 6, more preferably in the range of ⁇ 1.5 to ⁇ 4 and most preferably in the range of ⁇ 1.5 to ⁇ 3.5.
• the one first polyhydroxy compound is a polyester polyol.
• the polyester polyol has a hydroxyl value in the range of ⁇ 30 to ⁇ 600 mg KOH/g, more preferably in the range of ⁇ 30 to ⁇ 500 mg KOH/g and most preferably in the range of ⁇ 30 to ⁇ 450 mg KOH/g determined according to DIN 53240.
• the polyester polyol has a functionality in the range of ⁇ 2 to ⁇ 6, more preferably in the range of ⁇ 2 to ⁇ 5 and most preferably in the range of ⁇ 2 to ⁇ 4.
• Polyester polyol as suitable polyhydroxy compound for the present invention comprise of at least one carboxylic acid and at least one C 2 to C 10 alkyl polyol.
• carboxylic acid refers to saturated and/or unsaturated polycarboxylic acid such as dicarboxylic acid.
• the at least one carboxylic acid may contain additional functional groups such as, but not limited to hydroxyl groups.
• the at least one dicarboxylic acid is preferably an aliphatic dicarboxylic acid of the general formula HOOC—(CH 2 ) y —COOH, where y is a real number from 2 to 20, examples being succinic acid, adipic acid, glutaric acid, succinic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, heptane dicarboxylic acid, octane dicarboxylic acid, nonane dicarboxylic acid, decane dicarboxylic acid, undecane dicarboxylic acid and dodecane dicarboxylic acid.
• the dicarboxylic acids can be used individually or as mixtures, e.g.
• polyester polyols in the form of a mixture of succinic acid, glutaric acid and adipic acid.
• dicarboxylic acid derivatives such as dicarboxylic esters having from 1 to 4 carbon atoms in the alcohol radical, dicarboxylic anhydrides or dicarboxylic acid chlorides in place of the dicarboxylic acids.
• At least one C 2 to C 10 alkyl polyol is selected from the group consisting of ethanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,10-decanediol, 2,2-dimethyl-1,3-propanediol, 2-methyl-1,3-propanediol, 1,2-propanediol, 3-methyl-1,5-pentanediol, dialkylene ether glycols such as diethylene glycol and dipropylene glycol, 2,2-bis(hydroxymethyl)1,3-propanediol and trimethylolpropane.
• the one first saturated polyhydroxy compound is selected from the group consisting of polyethylene glycol, polypropylene glycol and polypropylenoxide triol.
• the one second saturated polyhydroxy compound is selected from the group consisting of C 2 to C 56 alkyl polyol and sugar alcohol.
• the one second polyhydroxy compound is preferably a C 2 to C 32 alkyl polyol, more preferably a C 2 to C 12 alkyl polyol, particularly preferably a C 2 to C 6 alkyl polyol.
• C 2 to C 56 alkyl polyol refers to a linear or branched, cyclic or acyclic, saturated aliphatic residues that are substituted by at least two, preferably two, three, four or five, hydroxy groups.
• C 2 to C 32 alkyl polyols are ethanediol, propanediol, neopentylglycol, butanediol, pentanediol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, cyclohexanedimethanol, trimethylol propane, glycerol, trimethylolethane, pentaerithrytol, hexanediol, heptanediol, octanediol, nonanediol, decanediol, undecanediol, dodecanediol, tridecanediol, tetradecanediol, pentadecanediol, hexadecanediol, heptadecanediol, octadecanediol, nona
• Examples of preferred C 2 to C 12 alkyl polyols are ethanediol, propanediol, neopentylglycol, butanediol, pentanediol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, cyclohexanedimethanol, trimethylol propane, glycerol, trimethylolethane, pentaerithrytol, hexanediol, heptanediol, octanediol, nonanediol, decanediol, undecanediol, dodecanediol and isomers thereof.
• More preferred C 2 to C 6 alkyl polyols are ethanediol, propanediol, neopentylglycol, butanediol, pentanediol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, cyclohexanedimethanol, trimethylol propane, glycerol, trimethylolethane, pentaerithrytol, hexanediol and isomers thereof.
• the one second polyhydroxy compound is a sugar alcohol.
• sugar alcohol refers to alcohols derived from sugars.
• Sugar alcohols have the general formula HOCH 2 (CHOH) n CH 2 OH, wherein n is a real number in the range of ⁇ 2 to ⁇ 10.
• Suitable examples of sugar alcohols include but are not limited to xylitol, lactitol, erythritol, mannitol, sorbitol, galactitol and maltitol.
• the one second polyhydroxy compound is selected from the group consisting of propanediol, butanediol, glycerol, pentaerythritol and sorbitol.
• the one first polyhydroxy compound has a weight average molecular weight M w in the range of ⁇ 100 to ⁇ 20,000 g/mol, preferably in the range of ⁇ 150 to ⁇ 15,000 g/mol, more preferably in the range of ⁇ 200 to ⁇ 10,000 g/mol, still more preferably in the range of ⁇ 200 to ⁇ 8,000 g/mol and most preferably in the range of ⁇ 200 to ⁇ 6,000 g/mol determined according to DIN 55672-1.
• the one second polyhydroxy compound has a weight average molecular weight M w in the range of ⁇ 50 to ⁇ 2,000 g/mol, preferably in the range of ⁇ 50 to ⁇ 1,500 g/mol, still more preferably in the range of ⁇ 50 to ⁇ 1,000 g/mol and most preferably in the range of ⁇ 50 to ⁇ 500 g/mol determined according to DIN 55672-1.
• the amount of the one first saturated polyhydroxy compound is in the range of ⁇ 5.0 wt. % to ⁇ 40 wt. %, based on the total weight of the two-component composition.
• the amount of the one second saturated polyhydroxy compound is in the range of ⁇ 0.2 wt. % to ⁇ 20 wt. %, based on the total weight of the two-component composition.
• the first and the second polyhydroxy compound can be in any state.
• state refers to the physical form of polyhydroxy compound.
• the first and the second polyhydroxy compound is in a liquid state.
• additional amount of water is added to the composition of the presently claimed invention, such that the amount of water present in the two-component coating composition is in the range of ⁇ 1 wt. % to ⁇ 50 wt. %, preferably in the range of ⁇ 5 wt. % to ⁇ 40 wt. %, more preferably in the range of ⁇ 10 wt. % to ⁇ 40 wt. %, based on the total weight of the two-component composition.
• Component A comprises at least one metal component selected from the group consisting of metal oxide, metal hydroxide, metal aluminate and metal silicate and mixtures thereof.
• the at least one metal component is selected from the group consisting of metal oxides and metal hydroxides.
• the metal oxides and the metal hydroxides are based on the oxides and hydroxides of elements of group I B, II A, II B, VI B, VII B, preferably group II A.
• Group herein denotes the group of the periodic table.
• the at least one metal oxide and/or the at least one metal hydroxide is selected from the group consisting of magnesium oxide, magnesium hydroxide, calcium oxide and calcium hydroxide, more preferably calcium hydroxide and calcium oxide and most preferably calcium hydroxide.
• a calcium compound selected from calcium hydroxide and/or calcium oxide prevents the formation of bubbles or blisters on the cured product's surface by quenching the CO 2 which is generated by the reaction of the isocyanate compounds and water that is present in the one first polyhydroxy compound.
• the at least one metal oxide present in the two-component coating composition needs to be stabilized or else it sediments as a nonredispersible mass within few days' time.
• the use of C 2 to C 6 alkyl polyols stabilizes the metal oxide and prevents its sedimentation even after storage for long period of time.
• the amount of the at least one metal oxide and/or the at least one metal hydroxide is in the range of ⁇ 2 wt. % to ⁇ 50 wt. %, preferably in the range of ⁇ 5 wt. % to ⁇ 40 wt. %, more preferably in the range of ⁇ 10 wt. % to ⁇ 40 wt. %, based on the total weight of the two-component composition.
• At least one polyisocyanate includes aliphatic polyisocyanate, cycloaliphatic polyisocyanate, aromatic polyisocyanate, modified polyisocyanate containing for example uretonimine groups, allophanate groups, isocyanurate groups, urethane groups and biuret groups.
• the at least one polyisocyanate is at least one diisocyanate of the abovementioned aliphatic polyisocyanate, cycloaliphatic polyisocyanate, aromatic polyisocyanate and modified polyisocyanate.
• Representative examples of these preferred diisocyanates may be found, for example, from U.S. Pat. Nos. 4,385,133, 4,522,975 and 5,167,899.
• Suitable cycloaliphatic polyisocyanates include those in which two or more of the isocyanato groups are attached directly and/or indirectly to the cycloaliphatic ring.
• Aromatic polyisocyanates include those in which two or more of the isocyanato groups are attached directly and/or indirectly to the aromatic ring.
• the aliphatic polyisocyanates and cycloaliphatic polyisocyanates can comprise 6 to 100 carbon atoms linked in a straight chain or cyclized and having two isocyanate reactive end groups.
• the at least one polyisocyanate is selected from the group consisting of pentamethylene diisocyanate, hexamethylene diisocyanate (HDI), Isophorone diisocyanate (IPDI), 2,2,4- and 2,4,4-trimethyl-1,6-hexamethylene diisocyanate, tetramethoxybutane 1,4-diisocyanate, butane-1,4-diisocyanate, dicyclohexylmethane diisocyanate, cyclohexane 1,3-and 1,4-diisocyanate, 1,12-dodecamethylene diisocyanate, diisocyanates of dimeric fatty acids; lysine methyl ester diisocyanate, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane, hydrogenated diphenylmethane diisocyanate (H12MDI), hydrogenated 2,4-tolylene diiso
• Methylene diphenyl diisocyanate is available in three different isomeric forms, namely 2,2′-methylene diphenyl diisocyanate (2,2′-MDI), 2,4′-methylene diphenyl diisocyanate (2,4′-MDI) and 4,4′-methylene diphenyl diisocyanate (4,4′-MDI).
• MDI can be classified into monomeric MDI (also designated MMDI) and polymeric MDI (PMDI) referred to as technical MDI.
• MMDI monomeric MDI
• PMDI polymeric MDI
• polymeric MDI is the preferred one.
• Polymeric MDI includes oligomeric species and MDI isomers.
• polymeric MDI may contain a single MDI isomer or isomer mixtures of two or three MDI isomers, the balance being oligomeric species.
• Polymeric MDI tends to have isocyanate functionalities of higher than 2.
• the isomeric ratio as well as the amount of oligomeric species can vary in wide ranges in these products.
• polymeric MDI may typically contain about 30 to 80 wt. % of MDI isomers, the balance being said oligomeric species.
• the MDI isomers are often a mixture of 4,4′-MDI, 2,4′-MDI and very low levels of 2,2′-MDI.
• the at least one polyisocyanate is selected from the group consisting of oligomers and/or prepolymers of hexamethylene diisocyanate (HDI), methylene diphenyl diisocyanate (MDI) or a derivative of MDI such as polymeric methylene diphenyl diisocyanate, carbodiimide-modified methylene diphenyl diisocyanate.
• HDI hexamethylene diisocyanate
• MDI methylene diphenyl diisocyanate
• a derivative of MDI such as polymeric methylene diphenyl diisocyanate, carbodiimide-modified methylene diphenyl diisocyanate.
• Polymeric methylene diphenyl diisocyanate and carbodiimide-modified methylene diphenyl diisocyanate are commercially available, for e.g. Lupranat® M, Lupranat® MI and Lupranat® MM from BASF SE or Desmodur MDI-types from Covestro and polyisocyanate resin based on hexamethylene diisocyanate (HDI) is commercially available, for e.g. Desmodur N Types® from Covestro, TolonateTM X Flo from Vencorex.
• the polyisocyanate can be in any state.
• state refers to the physical form of the polyisocyanate.
• the polyisocyanate is in a liquid state.
• the at least one polyisocyanate is present in an amount in the range of ⁇ 10 wt. % to ⁇ 90 wt. %, preferably in the range of ⁇ 20 wt. % to ⁇ 90 wt. %, more preferably in the range of ⁇ 20 wt. % to ⁇ 80 wt. %, most preferably in the range of ⁇ 30 wt. % to ⁇ 80 wt. %, based on the total weight of the two-component composition.
• the two-component composition of the present invention further may comprise one catalyst or several catalysts.
• the amine catalyst is a tertiary aliphatic amine catalyst.
• the tertiary aliphatic amine catalyst is selected from the group consisting of triethylenediamine, pentamethyldiethylenetriamine, dimethylcyclohexylamine, 2,2′-dimorpholinodiethyl ether, 2-(2-dimethyl-aminoethoxy) ethanol, 2-dimethylaminoethyl 3-dimethyl aminopropyl ether, bis(2-dimethylaminoethyl)ether, N,N-dimethylpiperazine, N-(2-hydroxyethoxyethyl)-2-aza-norboranes, JeffcatTM, N,N,N,N-tetramethylbutane-1,3-diamine, N,N,N,N-tetra-methylpropane-1,3-diamine and N,N,N,N-tetramethylhexane-1,6-diamine, preferably 2,2′-dimorpholinodiethylether.
• the alkanolamine catalyst is selected from the group consisting of dimethylethanolamine, triethanolamine and mixture thereof.
• the metal catalyst is selected from the group consisting of mercury, lead, tin, bismuth, potassium, lithium, titanium, zirconium and zinc catalyst and mixture thereof.
• the metal catalyst is selected from the group consisting of dibutyltin dilaurate (DBTL), stannous octoate, potassium octoate, bismuth neodecanoate and zinc neodecanoate and mixtures thereof.
• DBTL dibutyltin dilaurate
• stannous octoate sodium octoate
• potassium octoate potassium octoate
• bismuth neodecanoate bismuth neodecanoate
• zinc neodecanoate zinc neodecanoate
• the amount of the at least one catalyst is in the range of ⁇ 0.05 wt. % to ⁇ 5.0 wt. %, preferably in the range of ⁇ 0.5 wt. % to ⁇ 5.0 wt. %, based on the total weight of the two-component composition.
• the two-component composition of the invention further comprises at least one additive.
• the person skilled in the art is well aware of these additives and any further additives that may be added to obtain the polyurethane composition as described hereinabove.
• the at least one additive is selected from the group consisting of emulsifying agents, flame retardants, antimicrobial agents, pigments, defoamers, stabilizers, plasticizers, diluents, wetting and dispersing agents and fillers.
• the emulsifying agent or an emulsifying polyol is selected from the group consisting of non-ionic surfactants and cationic surfactants.
• non-ionic surfactant is an ethoxylated alkyl polyether.
• Suitable emulsifying agent are available for example Lutensol® from BASF SE.
• Suitable flame retardants include, for example, tricresyl phosphate, tris(2-chloroethyl) phosphate, tris(2-chloropropyl) phosphate, tris(1,3-dichloropropyl) phosphate, tris(2,3-dibromo ⁇ propyl) phosphate and tetrakis(2-chloroethyl) ethylene diphosphate.
• inorganic flame retardants such as red phosphorus, aluminium oxide hydrate, antimony trioxide, arsenic trioxide, ammonium polyphosphate and calcium sulfate or cyanuric acid derivatives, e.g., melamine, or mixtures of two or more flame retardants, e.g., ammonium phosphates and melamine, and also optionally starch and/or expandable graphite to confer flame retardancy on the polyurethane prepared according to the present invention.
• inorganic flame retardants such as red phosphorus, aluminium oxide hydrate, antimony trioxide, arsenic trioxide, ammonium polyphosphate and calcium sulfate or cyanuric acid derivatives, e.g., melamine, or mixtures of two or more flame retardants, e.g., ammonium phosphates and melamine, and also optionally starch and/or expandable graphite to confer flame retardancy on the polyurethane prepared according to the present invention.
• Antimicrobials agents such as biocides, bactericides and fungistats are used as additives.
• Representative examples are N-trichloromethylthio phthalimide, 10,10′-Oxybisphenoxarsine, and 2-N-Octyl-6-isothiazoline.
• pigment should be understood as meaning white or coloured, mineral or organic particle which is intended to colour and/or opacify the composition containing it.
• the pigment may be white or coloured, and mineral and/or organic.
• Suitable mineral pigments include, but are not restricted to, titanium oxide, titanium dioxide, zirconium oxide, zirconium dioxide, cerium oxide, cerium dioxide, zinc oxide, iron oxide, chromium oxide, ferric blue, manganese violet, ultramarine blue and chromium hydrate, and mixtures thereof.
• pigments examples include Bayferrox® from Lanxess, Germany and Heucosin® from Heubach.
• Stabilizers for the purposes of the present invention are additives to protect polyurethanes from harmful environmental influences. Examples are primary and secondary antioxidants, hindered amine light stabilizers, UV absorbers, hydrolysis control agents and quenchers.
• An example of a primary antioxidant is Irganox® from BASF. It suppresses the formation of free radical species and hydroperoxides in polyols both during storage and conversion.
• UV absorbers protect the polyurethanes from UV light-induced oxidation.
• An example of UV absorber is Tinuvin®, from BASF.
• hindered amine light stabilizers is Chimassorb® from BASF.
• Suitable stabilizers are silane compounds such as Cycloquart® from BASF.
• additives are one or more plasticizers, such as phenyl alkanesulfonates, dialkyl phthalate, triisobutyl phosphate, triethylene glycol bis(2-ethylhexanoate) and bis(isopropyl)naphthalene.
• plasticizers such as phenyl alkanesulfonates, dialkyl phthalate, triisobutyl phosphate, triethylene glycol bis(2-ethylhexanoate) and bis(isopropyl)naphthalene.
• the diluent for the purpose of the present invention is an organic solvent.
• suitable organic solvents are naphthalenes, mineral spirits or alcohols, low molecular mass diols, such as alkylene glycols and dimethylolcyclohexane.
• Preferable wetting and dispersing agents are salts of unsaturated polyamine amides and low-molecular acidic polyesters and mixtures thereof, for example Antiterra® U, Disperbyk®, Byk® 088 from BYK Chemie.
• Fillers include the customary, familiar organic and inorganic fillers, reinforcing agents and weighting agents.
• inorganic fillers such as silicatic minerals, for example sheet-silicates such as antigorite, serpentine, hornblendes, amphibols, chrisotile, talc; metal oxides, such as kaolin, aluminium oxides, aluminium silicate, titanium oxides and iron oxides, metal salts such as chalk, barite and inorganic pigments, such as cadmium sulfide, zinc sulfide and also glass particles.
• silicatic minerals for example sheet-silicates such as antigorite, serpentine, hornblendes, amphibols, chrisotile, talc
• metal oxides such as kaolin, aluminium oxides, aluminium silicate, titanium oxides and iron oxides
• metal salts such as chalk, barite and inorganic pigments, such as cadmium sulfide, zinc sul
• Useful organic fillers include for example carbon black, melamine, expandable graphite, rosin, cyclopentadienyl resins, graft polymers, cellulose fibres, polyester fibres based on aromatic and/or aliphatic dicarboxylic esters and carbon fibres.
• the inorganic and organic fillers can be used individually or as mixtures.
• the at least one additive can be added to component A and/or component B.
• the at least one additive is present in the range of ⁇ 0.1 wt. % to ⁇ 50 wt. %, preferably in the range of ⁇ 0.2 wt. % to ⁇ 30 wt. % based on the total weight of the two-component composition.
• the weight ratio of component (A) to component (B) is in the range of 1:20 to 3:1.
• the presently claimed invention is directed to a two-component coating composition
• a two-component coating composition comprising
• component B comprising at least one polyisocyanate.
• the presently claimed invention is directed to a two-component coating composition
• a two-component coating composition comprising
• Component B comprising at least one polyisocyanate.
• the presently claimed invention is directed to a two-component coating composition
• a two-component coating composition comprising
• component B comprising at least one polyisocyanate.
• the presently claimed invention is directed to a two-component coating composition
• a two-component coating composition comprising
• At least one second saturated polyhydroxy compound selected from the group consisting of C 2 to C 32 alkyl polyol and sugar alcohol;
• Component B comprising at least one polyisocyanate.
• the presently claimed invention is directed to a two-component coating composition
• a two-component coating composition comprising
• component B comprising at least one polyisocyanate.
• the presently claimed invention is directed to a two-component coating composition
• a two-component coating composition comprising
• component B comprising at least one polyisocyanate.
• the presently claimed invention is directed to a two-component coating composition
• a two-component coating composition comprising
• component B comprising at least one polyisocyanate.
• the presently claimed invention is directed to a two-component coating composition
• a two-component coating composition comprising
• Component B comprising at least one polyisocyanate.
• the presently claimed invention is directed to a two-component coating composition
• a two-component coating composition comprising
• component B comprising at least one polyisocyanate.
• the presently claimed invention is directed to a two-component coating composition
• a two-component coating composition comprising
• component B comprising at least one polyisocyanate.
• the presently claimed invention is directed to a two-component coating composition
• a two-component coating composition comprising
• component B comprising at least one polyisocyanate.
• the present invention is directed to a method of preparing the two-component composition, comprising
• component (A) by mixing the one first saturated polyhydroxy compound, optionally the one second saturated polyhydroxy compound, water, the at least one metal component selected from the group consisting of metal oxide, metal hydroxide, metal aluminate and metal silicate;
• step (a) and/or step (b) may be subjected to heating at a temperature in the range of ⁇ 50° C. to ⁇ 100° C.
• mixing refers to mechanical agitation of the components carried out in a vessel, not necessarily a reactor. Agitation means provide sufficient mixing to the components, which leads to better heat and mass distribution.
• the mixing is preferably vigorous mixing effected at a rotational speed in the range of ⁇ 100 to ⁇ 1000 rpm.
• step a) and/or step b) of the method of preparing the two-component composition as described hereinabove, independently of one another, optionally take place in the presence of at least one catalyst and/or at least one additive.
• the present invention is directed to a method for coating a surface by applying a two-component composition comprising
• component B comprising at least one polyisocyanate. wherein the coating has a tensile strength of at least 1.5 MPa determined according to ASTM D 638 method.
• the present invention is directed to a method for coating a surface by applying a two-component composition comprising
• component B comprising at least one polyisocyanate.
• the coating has a tensile strength of at least 1.5 MPa determined according to ASTM D 638 method.
• the present invention is directed to a method for coating a surface by applying a two-component composition comprising
• component B comprising at least one polyisocyanate.
• the present invention is directed to a method for coating a surface by applying a two-component composition comprising
• component B comprising at least one polyisocyanate.
• the coating has a tensile strength of at least 1.5 MPa determined according to ASTM D 638 method.
• the method described hereinabove optionally takes place in the presence of at least one catalyst and/or at least one additive.
• the presently claimed invention is directed to a method for coating a surface.
• the method comprises
• curing refers to the chemical reaction between component A and component B resulting in the formation of a hardened coat.
• the Shore hardness of the two-component composition is measured according to ASTM D2240 on a Durometer D scale. The test measures the resistance of the material toward indentation.
• the shore hardness (Shore D) of the two-component composition is in the range of ⁇ 40 to ⁇ 90.
• the tensile strength of the two-component composition is measured according to ASTM D 638.
• the two-component composition has a tensile strength in the range of ⁇ 4 N/mm 2 to ⁇ 30 N/mm 2 .
• the two-component composition finds use in the construction industry.
• the component part to be repaired or refurbished and the substrate on which the component part is to be constructed may be of any material, for instance concrete, mortar, metal, such as steel or copper, stones, bricks, masonry, coatings, composite material or plastic.
• the presently claimed invention is directed to a method for coating a surface whereby the surface is selected from concrete, mortar, metal, stones, bricks, masonry, coatings, composite material or plastic, comprising at least the step of applying a composition comprising
• the presently claimed invention is directed to a method for coating a surface whereby the surface is selected from concrete, mortar, metal, stones, bricks, masonry, coatings, composite material or plastic, comprising at least the step of applying a composition comprising
• step a) and/or step b) of the method for coating the surface as described hereinabove, independently of one another, optionally takes place in the presence of at least one catalyst and/or at least one additive.
• the composition used according to the present invention is a two-component composition.
• the two components are stored separately to avoid spontaneous reaction.
• the components may be assembled together as a package.
• the components are mixed together, hydration and curing reactions begin so that the composition is to be processed within the open time after mixing the components.
• one or more additional components may be included for specific purposes.
• an additional component comprising colouring agents such as pigments may be used for colouring purposes.
• composition is free from NH-reactive groups.
• composition offers good mechanical properties.
• a two-component coating composition comprising
• one first saturated polyhydroxy compound selected from the group consisting of polyether polyol, polyester polyol, C 2 to C 32 alkyl polyol and sugar alcohol;
• Component B comprising at least one polyisocyanate.
• composition according to embodiment 1, wherein the one first saturated polyhydroxy compound is selected from the group consisting of polyethylene glycol, polypropylene glycol, polypropyleneoxide diol and polypropyleneoxide triol.
• component A further comprises (iv) one second saturated polyhydroxy compound selected from the group consisting of polyether polyol, polyester polyol, C 2 to C 32 alkyl polyol and sugar alcohol, which is different from the one first saturated polyhydroxy compound.
• composition according to embodiment 1, wherein the at least one polyisocyanate is selected from the group consisting of pentamethylene diisocyanate, hexamethylene diisocyanate, Isophorone diisocyanate, 2,2,4- and 2,4,4-trimethyl-1,6-hexamethylene diisocyanate, tetramethoxybutane 1,4-diisocyanate, butane-1,4-diisocyanate, dicyclohexylmethane diisocyanate, cyclohexane 1,3- and 1,4-diisocyanate, 1,12-dodecamethylene diisocyanate, diisocyanates of dimeric fatty acids; lysine methyl ester diisocyanate, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane, hydrogenated diphenylmethane diisocyanate, hydrogenated 2,4-tolylene diisocyanate,
• metal catalyst is selected from the group consisting of tin, bismuth, potassium, lithium, titanium, zirconium, zinc catalyst and mixture thereof.
• composition according to embodiment 15 wherein the metal catalyst is selected from the group consisting of dibutyltin dilaurate, stannous octoate, bismuth-neodecanoate and zinc-neodecanoate.
• the two-component composition according to one or more of embodiments 1 to 21 further comprising at least one additive.
• the at least one additive is selected from the group consisting of emulsifying agents, flame retardants, antimicrobial agents, pigments, UV light stabilizers, plasticizers, diluents, organic and inorganic fillers.
• step (b) adding component (B) to the mixture of step (a) and mix to get a final coating composition.
• a two-component coating composition according to embodiment 1 comprising
• At least one second saturated polyhydroxy compound selected from the group consisting of C 2 to C 6 alkyl polyol and sugar alcohol;
• Component B comprising at least one polyisocyanate.
• step (b) adding component (B) to the mixture of step (a) and mixing to obtain a final coating composition.
• step b) applying the coating composition of step a) on a surface to obtain a coating; wherein the coating has a tensile strength of at least 1.5 MPa determined according to ASTM D 638 method.
• a two-component composition according to one or more of embodiments 1 to 28, is free from NH-reactive groups.
• Bayferrox® red is available from Lanxess, Germany.
• Arcol® polyol 1104 (low VOC medium molecular weight polypropylenoxide triol, hydroxyl number 53.5-57.5 mg KOH/g)
• Desmodur® N3600 polyfunctional aliphatic polyisocyanate resin based on hexamethylene diisocyanate
• Disperbyk® 190 wetting and dispersing additive
• Antiterra® U wetting and dispersing additive
• Lupranat® M10R diphenylmethane-4,4′-diisocyanate oligomer, with average functionality of 2.6
• Lupranat® M70R diphenylmethane-4,4′-diisocyanate oligomer, with average functionality of 2.9
• Plasticizer WVC3800 is available from Celanese.
• Barite 15 extra (barium sulfate) is available from Sibelco Specialty Minerals Europe.
• TolonateTM X FLO (aliphatic isocyanate polymer) is available from Vencorex.
• the Shore hardness was measured according to ASTM D2240 on a Durometer D scale. The test measures the resistance of the material toward indentation.
• the tensile strength was measured according to ASTM D 638 method.
• the accelerated weathering was determined by QUV accelerated weathering test. Coated and uncoated samples of 150 ⁇ 75 ⁇ 10 mm and 75 ⁇ 35 ⁇ 10 mm were artificially weathered in a QUV chamber (Q-Lab Corporation) with UVA radiation (0.45 W/m 2 at 313 nm) and condensation cycles for 1000 h following the artificial weathering conditions defined in ISO 16474-3 method. Changes to the coatings were assessed by measuring colour, gloss, water-repellency and roughness.
• component A 300 g
• component B 700 g
• a 1 mm film was applied by a toothed trowel and entrained air was removed with a spike roller. Pot life was about 15 minutes and tack free time was about 18 h.
• Desmodur N3600 (490 g), Tolonate X FLO (490 g), Byk 088 (19 g) and dibutyltin dilaurate (1 g) were mixed to get obtain component B (1000 g).
• component A (200 g) and component B (200 g) were mixed together and stirred at 300 rpm.
• a 1 mm film was applied by a toothed trowel and entrained air was removed with a spike roller.
• the composition was light stable as determined by measuring QUV for 1000 hours.

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